<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>box-sizing属性</title>
<style type="text/css">
.box1{
	width:300px;
	height:100px;
	background:gray;
	border:10px solid blue;
	box-sizing:content-box;
	}
.box2{
	width:300px;
	height:100px;
	background:gray;
    border:10px solid blue;
	box-sizing:border-box;
	}
</style>
</head>
<body>
<div class="box1">content-box属性</div>
<div class="box2">border-box属性</div>
</body>
</html>